<template>
  <div :class="className" :style="{ height: height, width: width }" />
</template>

<script>
import echarts from 'echarts'

require('echarts/theme/macarons') // echarts theme
import { debounce } from '@/utils'

export default {
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '300px'
    }
  },
  data() {
    return {
      chart: null
    }
  },
  mounted() {
    this.initChart()
    this.__resizeHandler = debounce(() => {
      if (this.chart) {
        this.chart.resize()
      }
    }, 100)
    window.addEventListener('resize', this.__resizeHandler)
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    window.removeEventListener('resize', this.__resizeHandler)
    this.chart.dispose()
    this.chart = null
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons')

      this.chart.setOption({
        title: {
          text: 'Graph 简单示例'
        },
        tooltip: {},
        animationDurationUpdate: 1500,
        animationEasingUpdate: 'quinticInOut',
        series: [
          {
            type: 'graph',
            layout: 'none',
            symbolSize: 50,
            roam: true,
            label: {
              normal: {
                show: true
              }
            },
            edgeSymbol: ['circle', 'arrow'],
            edgeSymbolSize: [4, 10],
            edgeLabel: {
              normal: {
                textStyle: {
                  fontSize: 20
                }
              }
            },
            data: [
              {
                name: '节点1',
                x: 100,
                y: 300
              },
              {
                name: '节点2',
                x: 1000,
                y: 300
              },
              {
                name: '节点3',
                x: 550,
                y: 100
              },
              {
                name: '节点4',
                x: 550,
                y: 500
              }
            ],
            // links: [],
            links: [
              {
                source: 0,
                target: 1,
                symbolSize: [5, 20],
                label: {
                  normal: {
                    show: true
                  }
                },
                lineStyle: {
                  normal: {
                    width: 5,
                    curveness: 0.2
                  }
                }
              },
              {
                source: '节点2',
                target: '节点1',
                label: {
                  normal: {
                    show: true
                  }
                },
                lineStyle: {
                  normal: { curveness: 0.2 }
                }
              },
              {
                source: '节点1',
                target: '节点3'
              },
              {
                source: '节点2',
                target: '节点3'
              },
              {
                source: '节点2',
                target: '节点4'
              },
              {
                source: '节点1',
                target: '节点4'
              }
            ],
            lineStyle: {
              normal: {
                opacity: 0.9,
                width: 2,
                curveness: 0
              }
            }
          }
        ]
      })
    }
  }
}
</script>
